It does not turn off after it reaches the preset temperature. Would this be the thermostat (old mercury thermostat) or the controls in the furnace?
Problems with gas furnce
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When you say that it doesn't turn off, do you mean the blower or the actual fire in the furnace? The blower will often continue to run after the thermostat stops calling for heat.
In general, mercury thermostats are pretty reliable. As a test, what happens if you manually lower the preset temp. Does the fire in the furnace stop?
In general, mercury thermostats are pretty reliable. As a test, what happens if you manually lower the preset temp. Does the fire in the furnace stop?
raven
New Member
Sorry, I wasn't too clear. The burner will not turn off unless I turn the thermostat down to 50 degrees. If I turn it down say 5 degrees or leave it at a set temp, the burner will not turn off unless I turn the system completly off.
Sounds like the old unit has gotten sticky. Replace it, they are inexpensive. You can put a low cost digital thermostat in its place that will allow you to dial in setback temps. LUX makes some good digital models. Just be sure to set the swing differential on the new unit so that the thermostat is not too sensitive.
I pulled the dial portion of the thermostat, breaking contact and burner shut off. I'll pick up a new programable tomorrow. Thanks for the help!
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